WIP kill otherdata for cname and dname
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parent
4bca364480
commit
a2fc07f45a
26
sanitize.go
26
sanitize.go
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@ -6,12 +6,30 @@ package dns
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// TODO(miek): This function will be extended to also look for CNAMEs and DNAMEs.
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// if found, it will prune rrs from the "other data" that can exist. Example:
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// if it finds a: a.miek.nl. CNAME foo, all other RRs with the ownername a.miek.nl.
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// will be removed.
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// will be removed. When a DNAME is found all RRs with an ownername below that of
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// the DNAME will be removed.
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func Dedup(rrs []RR) []RR {
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m := make(map[string]RR)
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keys := make([]string, 0, len(rrs))
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var cname map[nameClass]bool
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var dname map[nameClass]bool
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for _, r := range rrs {
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switch r.Header().Rrtype {
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case TypeCNAME:
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if cname == nil {
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cname = make(map[nameClass]bool)
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}
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cname[nameClass{r.Header().Name, r.Header().Class}] = true
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case TypeDNAME:
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if dname == nil {
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dname = make(map[nameClass]bool)
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}
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dname[nameClass{r.Header().Name, r.Header().Class}] = true
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default:
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if
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}
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key := normalizedString(r)
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keys = append(keys, key)
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if _, ok := m[key]; ok {
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@ -39,6 +57,12 @@ func Dedup(rrs []RR) []RR {
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return rrs[:i]
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}
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// nameClass is used to index the CNAME and DNAME maps.
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type nameClass struct {
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name string
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class uint16
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}
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// normalizedString returns a normalized string from r. The TTL
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// is removed and the domain name is lowercased.
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func normalizedString(r RR) string {
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